Question
Why do they exist as monoatoms in molecules?
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| $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
| $A$ | $B$ | $C$ | $D$ | $E$ | $F$ | $G$ | $H$ |
| $11$ | $12$ | $13$ | $14$ | $15$ | $16$ | $17$ | $18$ |
| $I$ | $J$ | $K$ | $L$ | $M$ | $N$ | $O$ | $P$ |